Water Turbidity

AUS-TGP-LVG-WTU General Moderate confidence

Benchmark Value

25 NTU
Thresholds: Lower: —, Upper: 25
Direction: Higher is desirable ↑
Form: UpperThreshold

Scoring Curve

This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context. The scoring engine uses 13 benchmarks together — the OptimalRange form drives the primary score, while 12 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary OptimalRange Guard UpperThreshold Guard MinimumOnly Guard OptimalRange Guard Point Guard OptimalRange Guard UpperThreshold Guard MaximumOnly Guard LowerThreshold Guard OptimalRange Guard UpperThreshold Guard Point Guard

Evidence & Context

A value of 25 NTU is proposed as this upper threshold.

Metric Definition:

Upper detrimental threshold for median turbidity indicating ecological harm

Benchmark Definition:

Upper detrimental threshold for median turbidity indicating ecological harm in temperate grassy woodlands and plains.

Justification:

Above this level, significant negative ecological impacts are expected, including reduced light penetration, degradation of benthic habitat, and stress on aquatic fauna.

Sources (1)

Preview of ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed August 12, 2025
ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed August 12, 2025 Government

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia

View Source

Supporting Sources (29)

Additional references from the underlying research that informed this benchmark.

Preview of 'CARE' OF COUNTRY: GRAZING MANAGEMENT AND SENSE OF PLACE - University of Tasmania, accessed August 6, 2025,
'CARE' OF COUNTRY: GRAZING MANAGEMENT AND SENSE OF PLACE - University of Tasmania, accessed August 6, 2025,
Contextual Support Journal

Sustainable land management practices for graziers - NSW Department of Primary Industries

View Source
Preview of An Examination of Stream Water Quality Data from Monitoring of Forest Harvesting in the Eastern Highlands of Victoria - MDPI, accessed August 1, 2025,
An Examination of Stream Water Quality Data from Monitoring of Forest Harvesting in the Eastern Highlands of Victoria - MDPI, accessed August 1, 2025,
Contextual Support Journal

An Examination of Stream Water Quality Data from Monitoring of Forest Harvesting in the Eastern Highlands of Victoria

View Source
Preview of Assessing Water Quality - Secondary Education Years 9 to 12 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025,
Assessing Water Quality - Secondary Education Years 9 to 12 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025,
Contextual Support Journal

Assessing water quality - ACT Waterwatch

View Source
Preview of Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed May 11, 2025,
Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed May 11, 2025,
Contextual Support Journal

Northern Territory Government (2020) Darwin Harbour Region Water Quality Objectives, Report Card Section 3.0.

View Source
Preview of Australian and New Zealand Guidelines for Fresh and Marine Water Quality, accessed August 2, 2025,
Australian and New Zealand Guidelines for Fresh and Marine Water Quality, accessed August 2, 2025,
Contextual Support

National Guidelines for Water Quality | Department of Natural Resources and Environment Tasmania

View Source
Preview of Characterising the relationship between water quality and water quantity, accessed August 5, 2025
Characterising the relationship between water quality and water quantity, accessed August 5, 2025
Contextual Support Journal

Report Card 2022-23 - EPA Victoria

View Source
Preview of Effects of livestock on riparian zone vegetation in a Australian Dryland River - ResearchGate
Effects of livestock on riparian zone vegetation in a Australian Dryland River - ResearchGate
Contextual Support Journal

Livestock grazing management and biodiversity conservation in Australian temperate grassy landscapes - ResearchGate

View Source
Preview of Effects of suspended solids on benthic macroinvertebrate fauna downstream of a road crossing, Jim Jim Creek, Kakadu - DCCEEW, accessed July 21, 2025,
Effects of suspended solids on benthic macroinvertebrate fauna downstream of a road crossing, Jim Jim Creek, Kakadu - DCCEEW, accessed July 21, 2025,
Contextual Support

Riparian Ecological Restoration Guidelines - Friends of Berowra Valley Inc.

View Source
Preview of Feeling sedimental: celebrating our impact improving water quality on the Reef, accessed July 25, 2025,
Feeling sedimental: celebrating our impact improving water quality on the Reef, accessed July 25, 2025,
Contextual Support Journal

Pasture utilisation

View Source
Preview of Grazing Management National Management Measures to Control Nonpoint Pollution from Agriculture - Environmental Protection Agency (EPA)
Grazing Management National Management Measures to Control Nonpoint Pollution from Agriculture - Environmental Protection Agency (EPA)
Contextual Support Journal

Grazing Management National Management Measures to Control Nonpoint Pollution from Agriculture - Environmental Protection Agency (EPA)

View Source
Preview of Historical land-use influences the long-term stream turbidity response to a wildfire - PubMed
Historical land-use influences the long-term stream turbidity response to a wildfire - PubMed
Contextual Support Journal

Historical land-use influences the long-term stream turbidity response to a wildfire - PubMed

View Source
Preview of Influence of a cattle access point on temporal changes in stream turbidity - ScienceOpen
Influence of a cattle access point on temporal changes in stream turbidity - ScienceOpen
Contextual Support Journal

Influence of a cattle access point on temporal changes in stream turbidity - ScienceOpen

View Source
Preview of Inland Waters - EPA, South Australia
Inland Waters - EPA, South Australia
Contextual Support Journal

Assessing translucent environmental water releases in the

View Source
Preview of Livestock grazing management and biodiversity conservation in Australian temperate grassy landscapes - ResearchGate, accessed August 5, 2025,
Livestock grazing management and biodiversity conservation in Australian temperate grassy landscapes - ResearchGate, accessed August 5, 2025,
Contextual Support Journal

Sustainable land management practices for graziers - NSW ...

View Source
Preview of Long-term monitoring and modelling of pasture regeneration and water quality from a Bothriochloa pertusa site in the Great Barrier Reef catchments - CSIRO PUBLISHING | The Rangeland Journal, accessed July 10, 2025,
Long-term monitoring and modelling of pasture regeneration and water quality from a Bothriochloa pertusa site in the Great Barrier Reef catchments - CSIRO PUBLISHING | The Rangeland Journal, accessed July 10, 2025,
Contextual Support Journal

Impacts of land management practices on riparian land - DBCA Library

View Source
Preview of Pasture growth | MLA, accessed August 28, 2025,
Pasture growth | MLA, accessed August 28, 2025,
Contextual Support Journal

Managing Riparian Areas - Private Forests Tasmania

View Source
Preview of Protecting Water Quality from Agricultural Runoff
Protecting Water Quality from Agricultural Runoff
Contextual Support Journal

Protecting Water Quality from Agricultural Runoff

View Source
Preview of Reducing the impacts of grazing on water quality - EPA Victoria
Reducing the impacts of grazing on water quality - EPA Victoria
Contextual Support Government

Reducing the impacts of grazing on water quality - EPA Victoria

View Source
Preview of Reducing the impacts of grazing on water quality - EPA Victoria, accessed August 8, 2025
Reducing the impacts of grazing on water quality - EPA Victoria, accessed August 8, 2025
Contextual Support Journal

Generic document, accessed July 19, 2025,

View Source
Preview of Riparian design guidelines to inform the ecological repair of urban waterways - CRC for Water sensitive cities
Riparian design guidelines to inform the ecological repair of urban waterways - CRC for Water sensitive cities
Contextual Support Journal

Riparian design guidelines to inform the ecological repair of urban waterways - CRC for Water sensitive cities

View Source
Preview of Sustainable land management practices for graziers - NSW Department of Primary Industries, accessed August 6, 2025,
Sustainable land management practices for graziers - NSW Department of Primary Industries, accessed August 6, 2025,
Contextual Support Journal

The water quality and economic benefits of agricultural management practices

View Source
Preview of The water quality and economic benefits of agricultural management practices, accessed August 5, 2025
The water quality and economic benefits of agricultural management practices, accessed August 5, 2025
Contextual Support Journal

Protecting farm waterways | Dairy News Australia

View Source
Preview of Understanding the relationship between livestock grazing and wetland condition - Arthur Rylah Institute for Environmental Research
Understanding the relationship between livestock grazing and wetland condition - Arthur Rylah Institute for Environmental Research
Contextual Support GreyLiterature

SURVEY OF LIVESTOCK INFLUENCES ON STREAM AND RIPARIAN ECOSYSTEMS IN THE WESTERN UNITED STATES - CiteSeerX

View Source
Preview of Water Assessment Water Quality Report Series
Water Assessment Water Quality Report Series
Contextual Support Journal

Water Assessment Water Quality Report Series

View Source
Preview of Water for livestock: interpreting water quality tests | NSW Department of Primary Industries, accessed July 25, 2025,
Water for livestock: interpreting water quality tests | NSW Department of Primary Industries, accessed July 25, 2025,
Direct Evidence Government

Water quality for farm water supplies | Managing dams - Agriculture Victoria

View Source
Preview of Water quality for primary industries, accessed July 30, 2025,
Water quality for primary industries, accessed July 30, 2025,
Contextual Support Government

Development of regional water quality and catchment guidelines for the conservation of aquatic ecosystems - NSW Environment Protection Authority

View Source
Preview of Water quality ratings 13 Corangamite CMA - River Detectives
Water quality ratings 13 Corangamite CMA - River Detectives
Contextual Support Journal

Water quality ratings 13 Corangamite CMA - River Detectives

View Source
Preview of Water Quality Standards - Turbidity Technical Review - Oregon.gov, accessed August 11, 2025,
Water Quality Standards - Turbidity Technical Review - Oregon.gov, accessed August 11, 2025,
Contextual Support Journal

Water Quality Standards - Turbidity Technical Review - Oregon.gov

View Source
Preview of Water supply in stock containment areas | Managing dams - Agriculture Victoria
Water supply in stock containment areas | Managing dams - Agriculture Victoria
Contextual Support Journal

Water supply in stock containment areas | Managing dams - Agriculture Victoria

View Source

Context

  • Region Australia
  • Biome Temperate Grassy Woodlands & Plains
  • Land Use Livestock Grazing & Pasture
  • Assessment Pristine Reference
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 1
  • Effective From 25 Mar 2026

Notes

This value corresponds to the upper limit of the ANZECC guideline for upland rivers and signifies a system transitioning to a degraded state.

Related Benchmarks

Other benchmarks in the AUS-TGP-LVG-WTU family.

5 NTU High
Livestock Grazing & Pasture · Pristine Reference
MaximumOnly Active v1
2 NTU Moderate
Livestock Grazing & Pasture · Pristine Reference
LowerThreshold Active v1
— NTU Moderate
Livestock Grazing & Pasture · Pristine Reference
OptimalRange Active v1